#565. Words starting with 's'
You are given some words. Print the words that start with the letter `s`, in their order, separated by spaces. If there are none, print `None`.
### Input
One line.
### Output
One line.
Examples
Input
robot robot computer computer computer civic planet
Output
None
Input
music refer input level summer winter
Output
summer
💡 You can solve it with Python, JavaScript or blocks. Read the input line by line with input(). Don't print a question (like input("Number: ")). Print exactly what the output asks for, nothing more.